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Finding the Fourth Proportional to 680.71, 1,021.69 and 421.22

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Solution

The fourth proportional to 680.71, 1,021.69 and 421.22 is: 632.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.71 : 1,021.69 = 421.22 : x
  2. Step 2: Convert to fraction form
    680.71/1,021.69 = 421.22/x
  3. Step 3: Cross multiply
    680.71x = 1,021.69 × 421.22
  4. Step 4: Simplify right side
    680.71x = 430,350.10
  5. Step 5: Solve for x
    x = 430,350.10/680.71
  6. Step 6: Final answer
    x = 632.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.